with that murder trial for the Houston woman accused of stabbing her boyfriend to death with her stiletto heel. Lots of drama when the prosecutor showed the jury that shoe to reenact the killing and Ryan smith has all the details. Reporter: Good morning. A stiletto heel front and center in Ana Trujillo's trial but in the courtroom, emotions are running high as the prosecution attempts to show Trujillo murdered her lover. This blue suede platform shoe with a 5 1/2-inch heel is the weapon prosecutors say Ana Trujillo used to kill her boyfriend Dr. Alf Stefan Andersson and in a dramatic courtroom demonstration the prosecutor straddling a dummy shows how they say Trujillo beat him to death. The state is trying to show that Ana went overboard and that a reasonable person wouldn't have struck him as many times. Reporter: Wearing a pair of high heels in court Trujillo is accused of stabbing Andersson 25 times in June of last year. Also had 15 to 20 other puncture wound as long his face and arms and neck. Reporter: Trujillo's attorney says Trujillo who has pled not guilty was simply defending herself with the only weapon she had available. Dr. Andersson had her in an excruciating hold when it got unbearably painful and she started striking him in the head. Reporter: The 45-year-old mother of two broke down in tears as her voice played in the courtroom. For the first time, the court heard the 911 calls that haven't been released to the public from the night of the alleged murder. Asking for help, she tells operators "I hit him with my shoe. He's bleeding a lot" before adding "He started beating me up." The police officer who picked up Trujillo from the crime scene testified that while she was emotional that night, it was an act telling the jury he only saw, quote, crocodile tears. The defense is hoping the jury will be able to sympathize with the woman in a desperate situation painting the alleged vic as an alcoholic with a violent streak. What happened between the pair that night seen here in his apartment complex lobby before his death may decide Trujillo's fate. The prosecution claimed in opening tapes that Trujillo, not the victim, had a history of being angry and aggressive in the relationship. But the challenge for the prosecution will be to show an intentional killing when the only person who knows what happened is the defendant herself. George? Okay, Ryan, thanks. Let's talk to Dan Abrams and pretty dramatic presentation, effective? Yeah, I mean effective and necessary, this is the murder weapon. You have to show exactly how you think it happened but as Ryan points out, this isn't an easy case when it comes to intentional murder. After all a heel does seem like the kind of thing you would use to defend yourself. They're trying to piece together evidence which is blood spatter, defensive wounds on him, no significant injuries on her, and eyewitness testimony putting that together and saying, there is nothing else you can conclude but that she intentionally used that as a weapon to kill him and that she was the aggressor. Also interesting that the prosecution put in that 911 tape even though it could work for the defense, as well. The defense has been talking about this 911 tape for awhile now saying wait till you hear the 911 tape. U.s. Going to change your view of the case. Yes. I mean, there's no question that the 911 tape is consistent with her account. But there have been many, many people convicted despite the fact that they have made 911 calls that are somewhat consistent with their defenses. Prosecutors had to introduce it. I don't think that it's a significant help to the defense. It doesn't hurt them. But it's not going to make a big difference for the defense. The defense wants to throw everything out there because all they have to do is raise some doubt. Raise some doubt and, remember, this is a claim of self-defense, remember, the legal standard is what a ream person would have done. What a reasonable person would have believed, if this was the risk of significant injury when she did this and so far we haven't seen a lot of evidence of that but she's going to take the stand, I think, and that could be incredibly powerful. We will be watching.

This transcript has been automatically generated and may not be 100% accurate.

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